Average, Mixture, and Alligation








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Quiz Begins Here

Q #1
⏰ :

Directions: Refer the following data to answer the questions given below.

Nirupama mixed 40 ml of 40% sulphuric acid solution with 76 ml of 25% sulphuric acid. In what ratio must the resulting solution should now be mixed with 50% sulphuric acid to give 40% sulphuric acid again?

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Q #2
⏰ :

Directions: Refer the following data to answer the questions given below.

When the average of two given numbers is subtracted from each of them respectively the larger of the two difference is 1 while the smaller is 0.5 less than the average. The value of the numerically larger of the two number is how many times that of the other?

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Q #3
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Directions: Refer the following data to answer the questions given below.

The average age of a man, his wife and their two children is 31 years. The man is six years older than his wife and one child is two years younger to the other. If, when the younger child was born the man was 32 years old, then find the present age of his wife

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Q #4
⏰ :

Directions: Refer the following data to answer the questions given below.

There are n students in a class. The average marks obtained by them is 75. Two students who got 50 and 58 marks left the class and another student who got between 80 and 88 marks joined the class. As a result of this, the average marks went up by 1 mark. If n is a prime number, how many marks did the new student get?

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Q #5
⏰ :

Directions: Refer the following data to answer the questions given below.

A group of chemistry students used two chemicals to conduct an experiment in their chemistry lab. One chemical contains 15% Carbon and the other chemical contains 30% Carbon. Once they mix the two samples the resulting chemical contains 22% Carbon. What volumes (in ml) of the two samples must be mixed to obtain 600 ml of the new chemical?

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